FS#349 - Remove requirement of permission READ_PHONE_STATE

Starting with Marshmallow (API level 23, Android 6.0) READ_PHONE_STATE is considered a dangerous permission (and as a result it can be revoked by the user at any time) but at the same time it is no longer required to check connection status.

Should restrict it to old API levels (NOTE the API documentation don’t mention this requirement anymore, but old devices DO require it).